HTML5+Canvas calls the camera function of the mobile phone to implement the image upload function (detailed explanation of pictures and texts in the next part)

This article mainly introduces HTML5+Canvas to call the mobile phone camera function to upload pictures in detail. It has a certain reference value. Interested friends can refer to it.

The previous article only talked about Front-end operation, this article specifically involves Java background processing. The front-end submits the Base64-encoded image data information to the Java background through Ajax, and then receives and processes the image data information on the Java side, Base64 decodes the image data information, and then uses the stream to The image data information is uploaded to the server for storage, and the path address of the image is stored in the database.

You can click this link to view the processing of local compression upload at the front desk:

HTML5+Canvas calls the mobile phone camera function to implement the image upload function (detailed picture and text in the first part)

Okay, no more nonsense, just post the code.

1. Front-end js code:

$.ajax({ 
        async:false,//是否异步 
        cache:false,//是否使用缓存 
        type: "POST", 
        data:{fileData:fileData,licenceName:licenceName,cust_tax_code:cust_tax_code,phoneNum:phoneNum,state_id:state_id}, 
        dataType: "json", 
        timeout: 1000, 
        contentType : 'application/x-www-form-urlencoded; charset=utf-8', 
        url: $('#ctx').val()+"CustomerCheckServlet?action=uploadLicence", 
        success: function(result){ 
          console.log(result); 
          if(result == true){ 
            alert('Success Upload~~~'); 
          }else if(result == false){ 
            alert('Error Upload~~~'); 
          } 
        }, 
        error: function(){ 
          alert("Error Linking~"); 
        } 
      });

2. Back-end Java code

/** 
   * 证件上传 
   * @param request 
   * @param response 
   * @throws IOException 
   */ 
  public void uploadLicence(HttpServletRequest request,HttpServletResponse response) throws IOException{ 
    log.info("=====================uploadLicence"); 
    df = new SimpleDateFormat("yyyy-MM-dd"); 
     
    String cust_tax_code = request.getParameter("cust_tax_code"); 
    String phoneNum = request.getParameter("phoneNum"); 
    String licenceName = request.getParameter("licenceName"); 
     
    String fileData = request.getParameter("fileData");//Base64编码过的图片数据信息，对字节数组字符串进行Base64解码 
    String imgPath = uploadFile(fileData,liceneName);//进行文件上传操作，上传到服务器中存放（这里是上传到服务器项目文件夹中存到） 
     
    boolean result = false;//最终上传成功与否的标志 
     
    custCheckInfo = new CustomerCheckInfo(); 
    custCheckInfo.setCust_tax_code(cust_tax_code); 
    custCheckInfo.setPhonenum(phoneNum); 
    custCheckInfo.setUpdate_time(df.format(new Date())); 
     
    boolean save_flag = customerService.saveRegistCertInfo(custCheckInfo);//保存路径 
     
    //判断数据库中的路径是否存在，并且文件夹中的文件是否存在(判断是否上传成功的标志) 
    boolean is_success = isSuccessUpload(licenceName, cust_tax_code, phoneNum); 
    if(save_flag && is_success){ 
      result = true; 
    } 
     
    //如果证件上传成功，则记录到记录表中 
    if(result){ 
      StateRecordInfo record = new StateRecordInfo(); 
      record.setCust_tax_code(cust_tax_code); 
      record.setPhonenum(phoneNum); 
      record.setState_id(state_id); 
       
      saveStateRecord(record);//执行状态保存操作 
    } 
     
    System.out.println("===result:"+result); 
    PrintWriter pw = response.getWriter(); 
    pw.print(result); 
    pw.close(); 
  }

/** 
   * 文件上传 
   * @param fileData 
   * @param fileName 
   * @return 
   */ 
  public String uploadFile(String fileData,String fileName){ 
    //在自己的项目中构造出一个用于存放用户照片的文件夹 
    String imgPath = this.getServletContext().getRealPath("/uploads/"); 
    //如果此文件夹不存在则创建一个 
    File f = new File(imgPath); 
    if(!f.exists()){ 
      f.mkdir(); 
    } 
    //拼接文件名称，不存在就创建 
    imgPath = imgPath + "/" + fileName + ".jpg"; 
    f = new File(imgPath); 
    if(!f.exists()){ 
      f.mkdir(); 
    } 
     
    log.info("====文件保存的位置："+imgPath); 
     
    //使用BASE64对图片文件数据进行解码操作 
    BASE64Decoder decoder = new BASE64Decoder(); 
    try { 
      //通过Base64解密，将图片数据解密成字节数组 
      byte[] bytes = decoder.decodeBuffer(fileData); 
      //构造字节数组输入流 
      ByteArrayInputStream bais = new ByteArrayInputStream(bytes); 
      //读取输入流的数据 
      BufferedImage bi = ImageIO.read(bais); 
      //将数据信息写进图片文件中 
      ImageIO.write(bi, "jpg", f);// 不管输出什么格式图片，此处不需改动 
      bais.close(); 
    } catch (IOException e) { 
      log.error("e:{}",e); 
    } 
    return imgPath; 
  }

/** 
   * 判断是否成功上传 
   * @return 
   */ 
  public boolean isSuccessUpload(String licenceName,String cust_tax_code,String phonenum){ 
    boolean flag = false; 
    String licencePath = "";//证件图片上传成功之后保存的路径 
     
    custCheckInfo = customerService.getCustomerCheckInfo(cust_tax_code, phonenum); 
    licencePath = custCheckInfo.getTax_regist_cert(); 
   
    //判断证件路径不为空并且在上传存放的文件夹中存在，就表明以上传成功 
    File f = new File(licencePath); 
    if(licencePath.length() >0 && f.exists()){ 
      flag = true; 
    } 
    return flag; 
  }

Okay, it’s all over here. This is the entire implementation process of HTML5+jQuery+Canvas calling the mobile phone camera function to upload pictures. It feels like My thinking is a bit confusing, well, let’s make progress slowly!

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